You'll notice, however, that a much later commentator has issues. Earlier, they had complained about the avarice of contemporary clerics; here, they write 'de veritate huius, doctores dubita[n]t', 'about the truth of this, theologians/scholars/teachers doubt.' Of course Brutus didn't hear from a sylvan goddess about his future passage to Britain! That'd be absurd!

I'm reminded, as I'm sure you are, of François Hédelin, whose 1627 treatise, Des satyres, brutes, monstres et démons, takes up the question of the famous talking satyr from Jerome's Life of Saint Paul, the First Hermit. It's perhaps a hard story to believe. Jerome himself offered proof, namely, that the corpse was sent along, salted, to the emperor in Antioch [postea cadauer exanime, ne calore aestatis dissiparetur, sale infusum et Antiochiam, ut ab Imperatore uideretur, adlatum est]. The skeptical and scientific Hédelin, however, insists that Constantine was already dead, so clearly this was impossible. And, anyway, the corpse must have been a monkey.